U.S. patent application number 11/611982 was filed with the patent office on 2010-06-03 for polyurea coating comprising a polyamine/mono(meth)acrylate reaction product.
Invention is credited to Steven V. Barancyk, John Furar, Thomas R. Hockswender, Jonathan T. Martz, Howard Senkfor.
Application Number | 20100136345 11/611982 |
Document ID | / |
Family ID | 39295556 |
Filed Date | 2010-06-03 |
United States Patent
Application |
20100136345 |
Kind Code |
A1 |
Barancyk; Steven V. ; et
al. |
June 3, 2010 |
POLYUREA COATING COMPRISING A POLYAMINE/MONO(METH)ACRYLATE REACTION
PRODUCT
Abstract
Coating compositions comprising a polyurea formed from a
reaction mixture comprising isocyanate and a (meth)acrylated amine
are disclosed. The (meth)acrylated amine is the reaction product of
a polyamine and a mono(meth)acrylate; the ratio of equivalents of
isocyanate groups to equivalents of amine groups is greater than 1
and the isocyanate and the (meth)acrylated amine reaction product
can be applied to a substrate at a volume mixing ratio of 1:1.
Methods for using the coatings, and substrates coated therewith are
also disclosed.
Inventors: |
Barancyk; Steven V.;
(Wexford, PA) ; Hockswender; Thomas R.; (Gibsonia,
PA) ; Furar; John; (Pittsburgh, PA) ; Martz;
Jonathan T.; (Glenshaw, PA) ; Senkfor; Howard;
(South Euclid, OH) |
Correspondence
Address: |
PPG INDUSTRIES INC;INTELLECTUAL PROPERTY DEPT
ONE PPG PLACE
PITTSBURGH
PA
15272
US
|
Family ID: |
39295556 |
Appl. No.: |
11/611982 |
Filed: |
December 18, 2006 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
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11211188 |
Aug 25, 2005 |
7611772 |
|
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11611982 |
|
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Current U.S.
Class: |
428/423.1 ;
427/427.4; 524/186; 524/589; 528/68; 528/75 |
Current CPC
Class: |
C08G 18/12 20130101;
C08G 18/6674 20130101; C09D 175/04 20130101; C08G 18/12 20130101;
C08G 18/5024 20130101; C08G 18/12 20130101; C08G 18/12 20130101;
Y10T 428/31551 20150401; C08G 18/3262 20130101; C08G 18/798
20130101; C08G 18/3821 20130101; C08G 18/50 20130101; C08G 18/3821
20130101 |
Class at
Publication: |
428/423.1 ;
427/427.4; 528/75; 528/68; 524/186; 524/589 |
International
Class: |
C09D 175/02 20060101
C09D175/02; B05D 1/02 20060101 B05D001/02; C08G 18/67 20060101
C08G018/67; C08G 18/32 20060101 C08G018/32; C08K 5/17 20060101
C08K005/17; B32B 27/28 20060101 B32B027/28 |
Claims
1. A coating composition comprising polyurea formed from a reaction
mixture comprising: a) a first component comprising isocyanate; and
b) a second component comprising a (meth)acrylated amine reaction
product of a polyamine and a mono(meth)acrylate; and wherein the
ratio of equivalents of isocyanate groups to equivalents of amine
groups is greater than 1 and the isocyanate and the (meth)acrylated
amine reaction product can be applied to a substrate at a volume
mixing ratio of 1:1.
2. The coating compositions of claim 1, wherein the (meth)acrylated
amine reaction product does not contain an aromatic polyamine or a
xylylenediamine.
3. The coating composition of claim 1, wherein the ratio of
equivalents of isocyanate groups to equivalents of amine groups is
greater 1.01 to 1.15:1.0.
4. The coating composition of claim 3, wherein the ratio of
equivalents of isocyanate groups to equivalents of amine groups is
1.01 to 1.5:1.0.
5. The coating composition of claim 1, wherein the isocyanate
comprises isocyanate prepolymer.
6. The coating composition of claim 1, wherein the polyamine
comprises isophorone diamine.
7. The coating composition of claim 1, wherein the polyamine
comprises 4,4'-diaminodicyclohexyl methane.
8. The coating composition of claim 1, wherein the polyamine
comprises 3,3'-dimethyl-4,4'-diaminocyclohexyl methane.
9. The coating composition of claim 1, wherein the polyamine
comprises a polyoxyalkyleneamines.
10. The coating composition of claim 1, wherein the
mono(meth)acrylate comprises methyl acrylate, methyl methacrylate,
ethyl acrylate, and/or butyl acrylate.
11. The coating composition of claim 1, wherein the polyamine
comprises isophorone diamine and the mono(meth)acrylate comprises
butyl acrylate.
12. The coating composition of claim 1, further comprising one or
more additional amines.
13. The coating composition of claim 1, wherein the one or more
additional amines comprise the reaction product of a
(meth)acrylate, a dialkyl maleate and/or dialkyl fumarate, and an
amine.
14. The coating composition of claim 12, wherein the one or more
additional amines comprise one or more of a. a diamine of structure
##STR00002## wherein R3-R6 are independently C1-C10 alkyl; b. a
diamine of structure ##STR00003## wherein R7-R10 are independently
C1-C10 alkyl; c. a polyoxyalkylenediamine and/or a
polyoxyalkylenetriamine comprising primary amino groups or
secondary amino groups that do not arise from the reaction of a
polyoxyalkylenediamine and/or a polyoxyalkylenetriamine with a
(meth)acrylate; d. an aspartic ester functional diamine with no
other functionality that is reactive with isocyanate; e. a reaction
product of a triamine with diethyl maleate and/or dibutyl maleate;
and/or f. a reaction product of a polyamine and a mono or
polyepoxy.
15. The coating composition of claim 1, comprising two or more
(meth)acrylated amine reaction products, wherein the polyamine(s)
and mono(meth)acrylate(s) in each reaction product can be the same
or different.
16. The coating composition of claim 1, further comprising a flame
retardant component.
17. A method for coating a substrate comprising applying to at
least a portion of the substrate the coating composition of claim
1.
18. The method of claim 17, wherein the first and/or second
component of the coating composition are heated prior to
application to the substrate.
19. A substrate coated at least in part with the coating of claim
1.
20. The substrate of claim 19, wherein the substrate comprises at
least a portion of a vehicle.
21. The substrate of claim 20, wherein the substrate comprises a
truck bed.
22. The substrate of claim 19, wherein the substrate comprises at
least a portion of a building structure.
23. The substrate of claim 21, wherein the truck bed has been
coated at least in part with a clearcoat having low surface
functionality after cure prior to application of the polyurea.
24. The coating of claim 1, wherein the reaction index is 1.01 to
1.5:1.
25. The coating of claim 1, wherein the isocyanate is free
isocyanate.
26. A coating composition comprising polyurea formed from a
reaction mixture comprising: a) a first component comprising
isocyanate; and b) a second component comprising a (meth)acrylated
amine reaction product of a polyamine and a mono(meth)acrylate and
further comprising one or more amines selected from the following:
a. a reaction product of a (meth)acrylate, a dialkyl maleate and/or
dialkyl fumarate, and an amine; b. a diamine of structure
##STR00004## wherein R3-R6 are independently C1-C10 alkyl; c. a
polyoxyalkylenediamine and/or a polyoxyalkylenetriamine comprising
secondary amino groups that do not arise from the reaction of a
polyoxyalkylenediamine and/or a polyoxyalkylenetriamine with a
(meth)acrylate; d. a reaction product of a triamine with diethyl
maleate and/or dibutyl maleate; and/or e. a reaction product of a
polyamine and a mono or polyepoxy.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This patent application is a Continuation-In-Part (CIP) of
patent application Ser. No. 11/211,188 filed on Aug. 25, 2005,
hereby incorporated by reference in its entirety.
FIELD OF THE INVENTION
[0002] The present invention is directed to a coating composition
comprising polyurea formed from a reaction mixture comprising a
first component comprising an isocyanate and a second component
comprising a (meth)acrylated amine reaction product of a polyamine
and a mono(meth)acrylate.
BACKGROUND OF THE INVENTION
[0003] Coating compositions comprising polyureas are used in a wide
variety of industries such as automotive, watercraft, aircraft,
industrial, construction, military, recreational equipment
including sports equipment and the like. In these industries,
considerable efforts have been made to develop coating compositions
that will impart the desired properties to the substrate or article
being coated. For example, coatings are used to protect against
damage due to corrosion, abrasion, impact, chemicals, ultraviolet
light, flame, heat, and/or other environmental exposure. In
addition to any of these functional properties, coatings can also
be used for decorative purposes.
[0004] Polyureas are generally formed by reacting amines and
isocyanates. The use of amines such as polyamines as crosslinkers
or "curatives" is well known. For example, amines are known to
crosslink with isocyanates to form urea compounds. Amines are also
known to be reactive with, and therefore used with, activated
unsaturated groups, epoxy groups, aromatic activated aldehyde
groups, cyclic carbonate groups, and acid and anhydride and ester
groups. Polyamine crosslinkers with primary amino groups can be
quite reactive with some of these functionalities under ambient or
low temperature conditions (i.e. less than 100.degree. C.). This
high reactivity can result in too short a potlife or other
difficulties in application, such as in high pressure impingement
spraying. Certain aliphatic secondary amines, however, are not
reactive enough with these various functionalities. It is therefore
desired to provide amine curatives that are sufficiently reactive,
but that provide an adequate potlife. There is a further desire to
provide such amine curatives that impart the desired
characteristics to the final composition in which they are
used.
SUMMARY OF THE INVENTION
[0005] The present invention is directed to a coating composition
comprising polyurea formed from a reaction mixture comprising a
first component comprising isocyanate and a second component
comprising a (meth)acrylated amine reaction product of a polyamine
and a mono(meth)acrylate, wherein the ratio of equivalents of
isocyanate groups to equivalents of amine groups is greater than 1
and the isocyanate and the (meth)acrylated amine reaction product
can be applied to a substrate at a volume mixing ratio of 1:1.
DETAILED DESCRIPTION OF THE INVENTION
[0006] The present invention is directed to a coating composition
comprising polyurea formed from a reaction mixture comprising a
first component comprising isocyanate and a second component
comprising a (meth)acrylated amine reaction product of a polyamine
and a mono(meth)acrylate, wherein the ratio of equivalent of
isocyanate groups to equivalent of amine groups is greater than 1
and the isocyanate and the (meth)acrylated amine reaction product
can be applied to a substrate at a volume mixing ratio of 1:1. The
reaction product of a polyamine and a mono(meth)acrylate is
sometimes referred to herein as the "(meth)acrylated amine reaction
product" or simply the "(meth)acrylated amine" or the "reaction
product" or like terms, and is sometimes referred to as a curative
because it will react or cure with the isocyanate to form a
polyurea. In certain embodiments, the (meth)acrylated amine
reaction product does not contain an aromatic polyamine or a
xylylenediamine
[0007] As used herein, the term "isocyanate" includes unblocked
compounds capable of forming a covalent bond with a reactive group
such as a hydroxyl or amine functional group. Thus, isocyanate can
refer to "free isocyanate", which will be understood to those
skilled in the art. In alternate non-limiting embodiments, the
isocyanate of the present invention can be monofunctional
containing one isocyanate functional group (NCO) or the isocyanate
used in the present invention can be polyfunctional containing two
or more isocyanate functional groups (NCOs).
[0008] Suitable isocyanates for use in the present invention are
numerous and can vary widely. Such isocyanates can include those
that are known in the art. Non-limiting examples of suitable
isocyanates can include monomeric and/or polymeric isocyanates. The
polyisocyanates can be selected from monomers, prepolymers,
oligomers, or blends thereof. In an embodiment, the polyisocyanate
can be C.sub.2-C.sub.20 linear, branched, cyclic, aromatic, or
blends thereof.
[0009] Suitable isocyanates for use in the present invention may
include but are not limited to isophorone diisocyanate (IPDI),
which is 3,3,5-trimethyl-5-isocyanato-methyl-cyclohexyl isocyanate;
hydrogenated materials such as cyclohexylene diisocyanate,
4,4'-methylenedicyclohexyl diisocyanate (H.sub.12MDI); mixed
aralkyl diisocyanates such as tetramethylxylyl diisocyanates,
OCN--C(CH.sub.3).sub.2--C.sub.6H.sub.4C(CH.sub.3).sub.2--NCO;
polymethylene isocyanates such as 1,4-tetramethylene diisocyanate,
1,5-pentamethylene diisocyanate, 1,6-hexamethylene diisocyanate
(HMDI), 1,7-heptamethylene diisocyanate, 2,2,4- and
2,4,4-trimethylhexamethylene diisocyanate, 1,10-decamethylene
diisocyanate and 2-methyl-1,5-pentamethylene diisocyanate; and
mixtures thereof.
[0010] Non-limiting examples of aromatic isocyanates for use in the
present invention may include but are not limited to phenylene
diisocyanate, toluene diisocyanate (TDI), xylene diisocyanate,
1,5-naphthalene diisocyanate, chlorophenylene 2,4-diisocyanate,
bitoluene diisocyanate, dianisidine diisocyanate, tolidine
diisocyanate, alkylated benzene diisocyanates,
methylene-interrupted aromatic diisocyanates such as
methylenediphenyl diisocyanate, 4,4'-isomer (MDI) including
alkylated analogs such as 3,3'-dimethyl-4,4'-diphenylmethane
diisocyanate, polymeric methylenediphenyl diisocyanate; and
mixtures thereof.
[0011] In a non-limiting embodiment, polyisocyanate monomer may be
used. It is believed that the use of a polyisocyanate monomer
(i.e., residual-free monomer from the preparation of prepolymer)
may decrease the viscosity of the polyurea composition thereby
improving its flowability, and may provide improved adhesion of the
polyurea coating to a previously applied coating and/or to an
uncoated substrate. For example, the coatings that have been
previously applied to a substrate can comprise functional groups
(e.g. hydroxy groups) that are reactive with isocyanates, thereby
enhancing adhesion of this coating to the polyurea composition of
the present invention applied over this coating. A lower viscosity
polyurea composition may also remain in a "flowable" state for a
longer period of time as compared to a comparable composition
having a higher viscosity. In alternate embodiments of the present
invention, at least 1 percent by weight, or at least 2 percent by
weight, or at least 4 percent by weight of the isocyanate component
comprises at least one polyisocyanate monomer.
[0012] In a further embodiment of the invention, the isocyanate can
include oligomeric polyisocyanates including but not limited to
dimers, such as the uretdione of 1,6-hexamethylene diisocyanate,
trimers, such as the biuret and isocyanurate of
1,6-hexanediisocyanate and the isocyanurate of isophorone
diisocyanate, and polymeric oligomers. Modified polyisocyanates can
also be used, including but not limited to carbodiimides and
uretdiones, and mixtures thereof. Suitable materials include,
without limitation, those available under the designation DESMODUR
from Bayer Corporation of Pittsburgh, Pa. and include DESMODUR N
3200, DESMODUR N 3300, DESMODUR N 3400, DESMODUR XP 2410, and
DESMODUR XP 2580.
[0013] As used herein, "isocyanate prepolymer" means polyisocyanate
that is pre-reacted with polyamine or another isocyanate reactive
group such as polyol. Suitable polyisocyanates include those
previously disclosed herein. Suitable polyamines are numerous and
may be selected from a wide variety known in the art. Examples of
suitable polyamines include but are not limited to primary and
secondary amines, and mixtures thereof, such as any of those listed
herein. Amine terminated polyureas may also be used. Amines
comprising tertiary amine functionality can be used provided that
the amine further comprises at least two primary and/or secondary
amino groups. Suitable polyols are numerous and may be selected
from a wide variety known in the art. Examples of suitable polyols
include but are not limited to polyether polyols, polyester
polyols, polyurea polyols (e.g. the Michael reaction product of an
amino function polyurea with a hydroxyl functional (meth)acrylate),
polycaprolactone polyols, polycarbonate polyols, polyurethane
polyols, poly vinyl alcohols, addition polymers of unsaturated
monomers with pendant hydroxyl groups such as those containing
hydroxy functional (meth)acrylates, allyl alcohols and mixtures
thereof.
[0014] In certain embodiments, the isocyanate includes an
isocyanate prepolymer and in other embodiments the isocyanate
includes an isocyanate prepolymer and one or more additional
isocyanates, such as one or more of the polyisocyanates described
above.
[0015] As noted above, the polyurea of the present composition is
formed from a reaction mixture comprising isocyanate and the
reaction product of a polyamine and a mono(meth)acrylate. As used
herein and as will be understood by one skilled in art the term
"(meth)acrylate" denotes both the acrylate and the corresponding
(meth)acrylate. The (meth)acrylate can be any suitable
mono(meth)acrylate or mixtures thereof. Suitable
mono(meth)acrylates include those having the formula:
##STR00001##
wherein R is H or methyl and R.sub.1 may be, without limitation,
alkyl or hydroxyalkyl, such as methyl, ethyl, 2-hydroxyethyl,
1-methyl-2-hydroxyethyl, 2-hydroxypropyl, propyl, isopropyl,
n-butyl, 2-hydroxybutyl, 4-hydroxybutyl, isobutyl, sec-butyl,
tert-butyl, hexyl, 2-ethylhexyl, cyclohexyl, methylcyclohexyl,
trimethylcyclohexyl, isobornyl, lauryl, stearyl and the like.
Non-limiting examples of mono(meth)acrylates include methyl
(meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl
(meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate,
tert-butyl (meth)acrylate, cyclohexyl (meth)acrylate, 2-ethylhexyl
(meth)acrylate, isooctyl (meth)acrylate, isodecyl (meth)acrylate,
lauryl (meth)acrylate, stearyl (meth)acrylate, isobornyl
(meth)acrylate, hydroxyethyl (meth)acrylate, hydroxypropyl
(meth)acrylate, 2-hydroxybutyl (meth)acrylate, 4-hydroxybutyl
(meth)acrylate, and adducts of hydroxy (meth)acrylates with
lactones such as the adducts of hydroxyethyl (meth)acrylate with
.epsilon.-caprolactone.
[0016] Suitable polyamines for use in the reaction product of the
present invention can be selected from a wide variety of known
primary amines, and mixtures thereof including polyamines having at
least two functional groups, such as di-, tri-, or higher
functional polyamines and mixtures thereof. The amine may be
aromatic or aliphatic, such as cycloaliphatic, or mixtures thereof.
Examples of suitable aliphatic polyamines include but are not
limited to ethylene diamine, 1,2-diaminopropane, 1,4-diaminobutane,
1,3-diaminopentane (DYTEK EP, Invista), 1,6-diaminohexane,
2-methyl-1,5-pentane diamine (DYTEK A, Invista),
2,5-diamino-2,5-dimethylhexane, 2,2,4- and/or
2,4,4-trimethyl-1,6-diamino-hexane, 1,11-diaminoundecane,
1,12-diaminododecane, 1,3- and/or 1,4-cyclohexane diamine,
1-amino-3,3,5-trimethyl-5-aminomethyl-cyclohexane, 2,4- and/or
2,6-hexahydrotoluoylene diamine, 2,4'-diaminodicyclohexyl methane,
4,4'-diaminodicyclohexyl methane (PACM-20, Air Products) and
3,3'-dialkyl 4,4'-diaminodicyclohexyl methanes (such as
3,3'-dimethyl-4,4'-diaminodicyclohexyl methane (DIMETHYL DICYKAN or
LAROMIN C260, BASF; ANCAMINE 2049, Air Products) and
3,3'-diethyl-4,4'-diaminodicyclohexyl methane), 2,4- and/or
2,6-diaminotoluene and 2,4'- and/or 4,4'-diaminodiphenyl methane,
or mixtures thereof. Additional suitable amines include but are not
limited to 3-(cyclohexylamine)propylamine,
3,3'-[1,4-butanediylbis]-1-propanamine, and diamino functional
polyetheramines having aliphatically bound primary amino groups,
examples of which include JEFFAMINE D-230, JEFFAMINE D-400,
JEFFAMINE D-2000, and JEFFAMINE D-4000 available from Huntsman
Corporation. It will be appreciated that when the amine is
hindered, the reaction time between the (meth)acrylated amine and
the isocyanate will be slower. This gives a longer pot-life or
work-processing time in those situations where a longer processing
time is desired.
[0017] In certain embodiments the polyamine is a triamine. Examples
of suitable triamines include dipropylene triamine,
bis(hexamethylene) triamine and triamino functional
polyetherpolyamines having aliphatically bound primary amino groups
(JEFFAMINE T-403, JEFFAMINE T-3000, JEFFAMINE T-5000 from Huntsman
Corporation.) In other embodiments the amine can be a tetraamine or
other higher functional amine.
[0018] In certain specific embodiments of the present invention,
the polyamine comprises 4,4'-diaminodicyclohexyl methane. In
certain other specific embodiments, the polyamine comprises
3,3'-dimethyl-4,4'-diaminocyclohexyl methane. In certain other
specific embodiments, the polyamine comprises isophorone diamine
("IPDA"). These polyamines can be reacted, for example, with any of
the mono(meth)acrylates listed herein.
[0019] The polyamine and mono(meth)acrylate can be reacted in any
ratio to give a suitable product. In certain embodiments, the
equivalent ratio of polyamine to mono(meth)acrylate is
substantially stoichiometric. In other embodiments, a slight excess
of amine (such as an equivalent ratio of amine to (meth)acrylate of
up to 1.05, or less than 1.03, to 1) is used to ensure that the
(meth)acrylate groups are essentially consumed or to leave some
unreacted primary amine. In certain embodiments the (meth)acrylated
amine is substantially free of unreacted primary amino groups.
Minimizing the amount of residual primary amine in the
(meth)acrylated amine slows its rate of reaction with the
isocyanate; thus the ratio of amine to mono(meth)acrylate can be
varied depending on the level of reactivity desired in the
resulting (meth)acrylated amine. Accordingly, in certain other
embodiments, an excess of amine to mono(meth)acrylate can be used
to alter the cure speed in the subsequent polyurea composition.
[0020] The equivalent ratio of polyamine to mono(meth)acrylate can
be any suitable ratio to give the desired properties to the
(meth)acrylated amine reaction product. For example, the ratio can
be 1:1 or 1.5:1 or 2:1.
[0021] The (meth)acrylated amine reaction product used in the
present invention can be formed, for example, in the manner
described in the examples, or any other suitable manner. In certain
embodiments, the (meth)acrylate is added to the amine over a period
of time to control the reaction temperature, since the reaction is
often exothermic. The addition can be commenced at ambient
temperature, or the amine can be heated prior to the beginning of
the addition. In certain embodiments, it might be desired to cool
the reaction mixture during the addition to control the exotherm.
At the conclusion of the addition, the reaction mixture can be
heated to complete the reaction. In other embodiments, all the
reactants can be combined together in the reactor vessel and heated
to reaction temperature. Generally, the reactions are conducted at
a temperature of <100.degree. C. The reaction mixture can
further include additives such as free radical polymerization
inhibitors such as hydroquinone, 4-methoxyphenol, 2,6-di-tert-butyl
p-cresol, and phenothiazine, catalysts including but not limited to
tin compounds (dibutyltin dilaurate, dibutyltin diacetate), Zn
compounds, Ti compounds, tertiary amines, and solvents including
but not limited to alcohols. The reactions can be run under
nitrogen or air.
[0022] The (meth)acrylated amine reaction product used according to
the present invention can be the result of the reaction of any
combination of polyamines and mono(meth)acrylates. That is, the
present polyurea compositions may comprise one or more polyamine
and/or one or more mono(meth)acrylate. The present polyurea
compositions may also comprise more than one (meth)acrylated amine
reaction product as described herein or one or more other amine
curatives in addition to the (meth)acrylated amine reaction
product(s). For example, the amine component may comprise one or
more amines that are the reaction product of an amine, a
(meth)acrylate and a dialkyl maleate and/or dialkyl fumarate, such
as those described in the U.S. patent application entitled
"(Meth)Acrylate/Aspartate Amine Curatives and Coatings and Articles
Comprising the Same" filed on even date herewith and hereby
incorporated by reference; one or more amines that are the reaction
product of a polyamine, a poly(meth)acrylate and a
mono(meth)acrylate or monoamine such as those described in the U.S.
patent application entitled: "Polyurea Coating Comprising an
Amine/(Meth)Acrylate Oligomeric Reaction Product" filed on even
date herewith and hereby incorporated by reference; one or more
amines that are the reaction product of a monoamine and a
(meth)acrylate, such as those described in the U.S. patent
application entitled: "Substrates Coated with a Polyurea Comprising
a (Meth)acrylated Amine Reaction Product" filed on even date
herewith and hereby incorporated by reference; and/or one or more
amines that are the reaction product of a triamine and a dialkyl
maleate and/or dialkyl fumarate, such as those described in the
U.S. patent application entitled: "Triamine/Aspartate Curative and
Coatings Comprising the Same" filed on even date herewith and
hereby incorporated by reference
[0023] The polyurea comprising the present (meth)acrylated amine
reaction product and an isocyanate can additionally include other
amines such as those known in the art including but not limited to
any polyamines or combinations thereof listed herein. Other amines
include secondary cycloaliphatic diamines such as JEFFLINK 754
(Huntsman Corporation, Houston, Tex.) and CLEARLINK 1000
(Dorf-Ketal Chemicals, LLC), aspartic ester functional amines, such
as those available under the name DESMOPHEN such as DESMOPHEN
NH1220, DESMOPHEN NH 1420, and DESMOPHEN NH 1520 (Bayer
Corporation), other aspartic ester functional materials, such as
the reaction products of triamines that comprise at least one
secondary amino group prior to reaction with a dialkyl maleate
and/or dialkyl fumarate including but not limited to the reaction
products of diethylene triamine, dipropylene triamine, and
bis-hexamethylene triamine with a dialkyl maleate and/or dialkyl
fumarate as described herein; examples of such materials include
the adduct of dipropylene triamine and diethyl maleate, the adduct
of dipropylene triamine and dibutyl maleate, the adduct of
bis-hexamethylene triamine with diethyl maleate, and the adduct of
bis-hexamethylene triamine with dibutyl maleate.
Polyoxyalkyleneamines are also suitable. Polyoxyalkyleneamines
comprise two of more primary or secondary amino groups attached to
a backbone, derived, for example, from propylene oxide, ethylene
oxide, butylene oxide or a mixture thereof. Examples of such amines
include those available under the designation JEFFAMINE, such as,
without limitation, JEFFAMINE D-230, D-400, D-2000, HK-511, ED-600,
ED-900, ED-2003, T-403, T-3000, T-5000, SD-231, SD-401, SD-2001,
and ST-404 (Huntsman Corporation). Such amines have an approximate
molecular weight ranging from 200 to 7500. When more than one
(meth)acrylated amine reaction product and/or isocyanate is used,
each polyamine, mono(meth)acrylate and/or isocyanate can be the
same or different.
[0024] Other suitable secondary amines that can be included in the
present composition are reaction products of materials comprising
primary amine functionality with acrylonitrile. Suitable amines
include any polyamine listed herein comprising primary amino
functionality. One example of such a material is the adduct of
4,4'-diaminodicyclohexylmethane and acrylonitrile. An example of a
commercially available material is the adduct of isophorone diamine
and acrylonitrile sold under the designation POLYCLEAR 136, (Hansen
Group LLC).
[0025] Other amines that can be used are adducts of primary
polyamines with mono or polyepoxies; an example of such a material
is the adduct of isophorone diamine with CARDURA E10P (available
from Hexion Speciality Chemicals, Inc).
[0026] In certain embodiments, the amine component of the polyurea,
and/or the polyurea itself, are substantially free of primary amine
functionality (unreacted primary amino groups). "Substantially free
of primary amine functionality" and like terms means that
theoretically there is no primary amine functionality but there
maybe some primary amine functionality present that is purely
incidental, i.e. impurities in amines that are otherwise secondary
amine functional and/or trace primary amine functionality that did
not react.
[0027] In an embodiment, the coating compositions of the present
invention may include a blend of polyurea and polyurethane. As used
herein, therefore, "polyurea" includes both polyurea and blends of
polyurea and polyurethane. It will be appreciated by those skilled
in the art that polyurethane can be formed as a by-product in the
reactions of the present invention. In alternate embodiments, the
polyurethane can be formed in-situ and/or it can be added to the
reaction mixture; a non-limiting example is an NCO functional
prepolymer formed by reaction of a polyol and a polyisocyanate as
disclosed herein. A non-limiting example of polyurethane formed
in-situ may include the reaction product of polyisocyanate and
hydroxyl-functional material. Non-limiting examples of suitable
polyisocyanates may include those described herein. Non-limiting
examples of suitable hydroxyl-functional material may include
polyols such as those described herein. Another example of
polyurethane formed in-situ may include the reaction product of a
hydroxyl functional prepolymer and isocyanate-functional material.
Suitable examples of these reactants may include those described
herein.
[0028] The polyurea coating composition of the present invention
may be formulated and applied using various techniques known in the
art. Accordingly, the present invention is further directed to
methods for coating a substrate comprising applying to at least a
portion of the substrate any of the coating compositions described
herein. In an embodiment, conventional spraying techniques may be
used. In this embodiment, the isocyanate and amine may be combined
such that the ratio of equivalents of isocyanate groups to
equivalents of amine groups is greater than 1 and the isocyanate
and amine can be applied to a substrate at a volume mixing ratio of
1:1; and the reaction mixture may be applied to an uncoated or
coated substrate to form a first coating on the uncoated substrate
or a subsequent coating on the coated substrate. When determining
the ratio of equivalents of isocyanate groups to equivalents of
reactive amine groups, the total amine groups are taken into
consideration that is the amine groups from the (meth)acrylated
amine curative as well as any other amine used in the coating.
[0029] It will be appreciated that the present compositions are two
component or "2K" compositions, wherein the isocyanate-containing
component and the amine-containing component are kept separate
until just prior to application. Such compositions will be
understood as curing under ambient conditions, although a heated
forced air or a heat cure can be applied to accelerate final cure
or to enhance coating properties such as adhesion. In an
embodiment, the sprayable coating composition may be prepared using
a two-component mixing device. In this embodiment, isocyanate and
amine are added to a high pressure impingement mixing device. The
isocyanate is added to the "A-side" and amine is added to the
"B-side". The A- and B-side streams are impinged upon each other
and immediately sprayed onto at least a portion of an uncoated or
coated substrate. The isocyanate and the amine react to produce a
coating composition that is cured upon application to the uncoated
or coated substrate. The A- and/or B-side can also be heated prior
to application, such as to a temperature of 140.degree. F. Heating
may promote a better viscosity match between the two components and
thus better mixing, but is not necessary for the curing reaction to
occur.
[0030] It is believed that the ratio of equivalents of isocyanate
groups to amine groups may be selected to control the rate of cure
of the coating composition of the present invention. It has been
found that cure and adhesion advantages may result when applying
the coating in a 1:1 volume ratio wherein the ratio of the
equivalents of isocyanate groups to amine groups (also known as the
reaction index) is greater than one, such as from 1.01 to 1.10:1,
or from 1.03 to 1.10:1, or from 1.05 to 1.08:1, or from 1.01 to 1.4
to 1, or from 1.01 to 1.5 to 1, or greater than 1.3 to 1. For
example, good adhesion can be obtained has been observed when using
the present coatings in using these ratios over clearcoats that
have low surface functionality after cure, such as carbamate
melamine, hydroxyl melamine, 2K urethane, and silane-containing
clearcoats. The term "1:1 volume ratio" means that the volume ratio
varies by up to 20% for each component, or up to 10% or up to
5%.
[0031] In a non-limiting embodiment, a commercially available
mixing device available commercially under the designation GUSMER
VR-H-3000 proportioner fitted with a GUSMER Model GX-7 spray gun
may be used. In this device, pressurized streams of the A- and
B-side components are delivered from two separate chambers and are
impacted or impinged upon each other at high velocity to mix the
two components and form a coating composition, which may be applied
to an uncoated or coated substrate using the spray gun. The mixing
forces experienced by the component streams may be depend upon the
volume of each stream entering the mixing chamber per unit time and
the pressure at which the component streams are delivered. A 1:1
volume ratio of the isocyanate and amine per unit time may equalize
these forces.
[0032] Another suitable application device known in the industry
includes a "static mix tube" applicator. In this device, the
isocyanate and amine are each stored in a separate chamber. As
pressure is applied, each of the components is brought into a
mixing tube in a 1:1 ratio by volume. Mixing of the components is
effected by way of a torturous or cork screw pathway within the
tube. The exit end of the tube may have atomization capability
useful in spray application of the reaction mixture. Alternatively,
the fluid reaction mixture may be applied to a substrate as a bead.
A static mix tube applicator is commercially available from Cammda
Corporation.
[0033] The polyurea coating compositions of the present invention
may be applied to a wide variety of substrates. Accordingly, the
present invention is further directed to a substrate coated with
any of the composition described herein. Non-limiting examples of
suitable substrates can include but are not limited to metal,
natural and/or synthetic stone, ceramic, glass, brick, cement,
concrete, cinderblock, wood and composites and laminates thereof;
wallboard, drywall, sheetrock, cement board, plastic, paper, PVC,
styrofoam, plastic composites, acrylic composites, ballistic
composites, asphalt, fiberglass, soil, gravel and the like. Metals
can include but are not limited to aluminum, cold rolled steel,
electrogalvanized steel, hot dipped galvanized steel, titanium and
alloys; plastics can include but are not limited to TPO, SMC, TPU,
polypropylene, polycarbonate, polyethylene, polyamides (Nylon). The
substrates can be primed metal and/or plastic; that is, an organic
or inorganic layer is applied thereto. Further, the coating
compositions of the present invention can be applied to said
substrates to impart one or more of a wide variety of properties
such as but not limited to corrosion resistance, abrasion
resistance, impact damage, flame and/or heat resistance, chemical
resistance, UV light resistance, structural integrity, ballistic
mitigation, blast mitigation, sound dampening, decoration and the
like. In non-limiting examples, the coating compositions of the
present invention can be applied to at least a portion a building
structure an article of manufacture such as but not limited to a
vehicle. "Vehicle" includes but is not limited to civilian,
commercial, and military land-, water-, and air-vehicles, for
example, cars, trucks, boats, ships, submarines, airplanes,
helicopters, humvees and tanks. The article of manufacture can be a
building structure. "Building structure" includes but is not
limited to at least a portion of a structure including residential,
commercial and military structures, for example, roofs, floors,
support beams, walls and the like. As used herein, the term
"substrate" may refer to a surface, either external or internal, on
at least a portion of an article of manufacture or the article of
manufacture itself. In an embodiment, the substrate is a truck
bed.
[0034] In an embodiment, the polyurea coating composition of the
present invention may be applied to a carrier film. The carrier
film can be selected from a wide variety of such materials known in
the art. Non-limiting examples of suitable carrier films may
include, but are not limited to thermoplastic materials,
thermosetting materials, metal foils, cellulosic paper, synthetic
papers, and mixtures thereof. As used herein, the term
"thermoplastic material" refers to any material that is capable of
softening or fusing when heated and of solidifying (hardening)
again when cooled. Non-limiting examples of suitable thermoplastic
materials may include polyolefins, polyurethanes, polyesters,
polyamides, polyureas, acrylics, and mixtures thereof. As used
herein, the term "thermosetting material" refers to any material
that becomes permanently rigid after being heated and/or cured.
Non-limiting examples may include polyurethane polymers, polyester
polymers, polyamide polymers, polyurea polymers, polycarbonate
polymers, acrylic polymers, aminoplasts, isocyanates, epoxies,
copolymers thereof, and mixtures thereof.
[0035] As noted above, in certain embodiments, the polyurea coating
compositions of the present invention may be applied to a bare
(e.g., untreated, uncoated) substrate, a pretreated substrate
and/or coated substrate having at least one other coating. In a
non-limiting embodiment, the coating compositions of the present
invention may be applied as part of a multi-layer coating
composite. The first coating applied to a substrate may be selected
from a variety of coating compositions known in the art for surface
coating substrates. Non-limiting examples may include but are not
limited to electrodepositable film-forming compositions, primer
compositions, pigmented or non-pigmented monocoat compositions,
pigmented or non-pigmented base coat compositions, transparent
topcoat compositions, industrial coating compositions, and the
like. In another non-limiting embodiment, the coating compositions
of the present invention may be applied as part of a multi-layer
coating composite comprising a pretreated substrate and coating
layers such as but not limited to electrocoat, primer, base coat,
clear coat, and combinations thereof. In an embodiment, the clear
coat comprises silane functional groups either before or after
crosslinking and cure.
[0036] In a further embodiment, the polyurea coating compositions
of the present invention can be used in a two-coat application
resulting in a textured surface. A first coat is applied to an
uncoated or coated substrate to produce a smooth, substantially
tack-free layer. The "Tack-Free Method" is used to determine if the
layer is substantially tack-free. The Tack-Free Method includes
spraying the coating composition in one coat onto a non-adhering
plastic sheet to a thickness of from 10 to 15 mil (254-381
microns). When spraying is complete, an operator, using a loose
fitting, disposable vinyl glove, such as one commercially available
as AMBIDEX Disposable Vinyl Glove by Marigold Industrial, Norcross
Ga., gently touches the surface of the coating. The coating may be
touched more than one time by using a different fingertip. When the
glove tip no longer sticks to, or must be pulled from, the surface
of the layer, the layer is said to be substantially tack-free. The
time beginning from the completion of spraying until when the
coating is substantially tack-free is said to be the tack-free
time. In a non-limiting embodiment, the tack-free time and the cure
time may be controlled by balancing levels of various composition
components such as the ratio of primary amine to secondary
amine.
[0037] A second coat may then be applied to the first coating layer
as a texturizing layer or "dust coating". The second coating layer
can be applied by increasing the distance between the
application/mixing device and the coated substrate to form discrete
droplets of the coating composition prior to contacting the coated
substrate thereby forming controlled non-uniformity in the surface
of the second layer. The substantially tack-free first layer of the
coating is at least partially resistant to the second layer; i.e.,
at least partially resistant to coalescence of the droplets of
coating composition sprayed thereon as the second layer or dust
coating such that the droplets adhere to but do not coalesce with
the previous layer(s) to create surface texture. The final coating
layer typically exhibits more surface texture than the first or
previous coating layers. An overall thickness of the coating layers
may range from 20 to 1000 mils, or from 40 to 150 mils, or from 60
to 100 mils (1524-2540 microns), or from 500 to 750 mils. In a
non-limiting embodiment, the first layer may be the majority of the
total thickness and the dust coating may be from 15-50 mils
(381-1270 microns).
[0038] In various embodiments of the present invention, the "first"
coating layer may comprise one, two, three or more layers; and the
"second" coating layer may be one or more subsequent layers applied
thereover. For example, four polyurea layers may be applied, with
the fourth layer being the dust coating and each layer having a
thickness of from 15 to 25 mil (381-635 microns). It will be
appreciated that these coating layers are relatively "thick". The
coating compositions of the present invention can also be applied
as much thinner layers as well, such as 0.1 to less the 15 mils,
such as 0.1 to 10, 0.5 to 3 or 1 to 2 mils. Such layers can be used
alone or in conjunction with other coating layers, such as any of
those known in the art or otherwise described herein. When applied
at a sufficient thickness (e.g. 10 to 1000 mils, such as 100 to 200
mils, or 125 mils+/-10 mils), the present polyurea layer(s) can
provide blast mitigation. "Blast mitigation" means, for example,
protection in the event of a close proximity blast or explosion.
This protection can include, for example, protection of a structure
or portion of a structure, such as a building structure, vehicle,
aircraft, ship/boat, shipping container and the like, from collapse
and/or destruction, protection against flying debris and blast
fragments, and the like.
[0039] In alternate embodiments, the coating layers may comprise
the same or different polyurea coating compositions. For example,
the first layer may be a polyurea composition comprising aliphatic
and/or aromatic amine components and/or aliphatic and/or aromatic
polyisocyanate; and the second layer may comprise the same or
different combination of aliphatic and/or aromatic amine components
and/or aliphatic and/or aromatic polyisocyanate. "Amine component"
in this context means any amine used in the present coatings. In a
further embodiment, the outermost coating layer may comprise a
coating composition that provides a desired durability. The desired
durability may depend upon the use of the coating composition of
the present invention and/or the substrate to which it may be
applied. In an embodiment, a combination of aliphatic and/or
aromatic amine and/or polyisocyanate may be selected such that the
composition of the outermost layer has substantial durability. For
example, the outermost coating layer may have a durability of 1000
kJ to 6000 kJ, or from 800 hours to 4000 hours, when tested using a
Weatherometer (Atlas Material Testing Solutions) in accordance with
method SAE J1960. In this embodiment, the first layer may be a
polyurea composition comprising polyisocyanate and amine, wherein
at least one of the amine and/or polyisocyanate may comprise an
aromatic moiety, and the second layer may be a polyurea composition
comprising predominantly aliphatic amine and aliphatic
polyisocyanate, with little or no aromaticity.
[0040] The polyurea coating compositions of the present invention
may optionally include materials standard in the art such as but
not limited to fillers, fiberglass, stabilizers, thickeners,
fillers, adhesion promoters, catalysts, colorants, antioxidants, UV
absorbers, hindered amine light stabilizers, rheology modifiers,
flow additives, anti-static agents and other performance or
property modifiers that are well known in the art of surface
coatings, and mixtures thereof. For example, the present coatings
can further comprise flame and/or heat resistant material, such as
any one or more of those disclosed in U.S. application Ser. No.
11/591,312, hereby incorporated by reference in its entirety.
Fillers can include clay and/or silica, and adhesion promoters can
include amine functional materials, aminosilanes and the like;
examples of fillers and adhesion promoters are further described in
U.S. Publication No. 2006/0046068, hereby incorporated by reference
in its entirety. These additives can be combined with the
isocyanate, the (meth)acrylated amine reaction product, or both. In
certain embodiments, the coating may further comprise small amounts
of solvent and in certain embodiments the coating may be
substantially solvent-free. "Substantially solvent-free" means that
the coating may contain a small amount of solvent, such as 5%, 2%,
1% or less.
[0041] As used herein, the term "colorant" means any substance that
imparts color and/or other opacity and/or other visual effect to
the composition. The colorant can be added to the coating in any
suitable form, such as discrete particles, dispersions, solutions
and/or flakes. A single colorant or a mixture of two or more
colorants can be used in the coatings of the present invention.
[0042] Example colorants include pigments, dyes and tints, such as
those used in the paint industry and/or listed in the Dry Color
Manufacturers Association (DCMA), as well as special effect
compositions. A colorant may include, for example, a finely divided
solid powder that is insoluble but wettable under the conditions of
use. A colorant can be organic or inorganic and can be agglomerated
or non-agglomerated. Colorants can be incorporated into the
coatings by grinding or simple mixing. Colorants can be
incorporated by grinding into the coating by use of a grind
vehicle, such as an acrylic grind vehicle, the use of which will be
familiar to one skilled in the art. The grind vehicle can also
comprise the (meth)acrylated amine curative of the present
invention either in total or in combination with any other amines
and polyols as described herein.
[0043] Example pigments and/or pigment compositions include, but
are not limited to, carbazole dioxazine crude pigment, azo,
monoazo, disazo, naphthol AS, salt type (lakes), benzimidazolone,
metal complex, isoindolinone, isoindoline and polycyclic
phthalocyanine, quinacridone, perylene, perinone, diketopyrrolo
pyrrole, thioindigo, anthraquinone, indanthrone, anthrapyrimidine,
flavanthrone, pyranthrone, anthanthrone, dioxazine,
triarylcarbonium, quinophthalone pigments, diketo pyrrolo pyrrole
red ("DPPBO red"), titanium dioxide, carbon black, carbon fiber,
graphite, other conductive pigments and/or fillers, and mixtures
thereof. The terms "pigment" and "colored filler" can be used
interchangeably.
[0044] Example dyes include, but are not limited to, those that are
solvent based such as pthalo green or blue, iron oxide, bismuth
vanadate, anthraquinone, perylene, aluminum and quinacridone.
[0045] Example tints include, but are not limited to, pigments
dispersed in water-based or water miscible carriers such as
AQUA-CHEM 896 commercially available from Degussa, Inc., CHARISMA
COLORANTS and MAXITONER INDUSTRIAL COLORANTS commercially available
from Accurate Dispersions division of Eastman Chemical, Inc.
[0046] As noted above, the colorant can be in the form of a
dispersion including, but not limited to, a nanoparticle
dispersion. Nanoparticle dispersions can include one or more highly
dispersed nanoparticle colorants and/or colorant particles that
produce a desired visible color and/or opacity and/or visual
effect. Nanoparticle dispersions can include colorants such as
pigments or dyes having a particle size of less than 150 nm, such
as less than 70 nm, or less than 30 nm. Nanoparticles can be
produced by milling stock organic or inorganic pigments with
grinding media having a particle size of less than 0.5 mm. Example
nanoparticle dispersions and methods for making them are identified
in U.S. Pat. No. 6,875,800 B2, which is incorporated herein by
reference. Nanoparticle dispersions can also be produced by
crystallization, precipitation, gas phase condensation, and
chemical attrition (i.e., partial dissolution). In order to
minimize re-agglomeration of nanoparticles within the coating, a
dispersion of resin-coated nanoparticles can be used. As used
herein, a "dispersion of resin-coated nanoparticles" refers to a
continuous phase in which is dispersed discreet "composite
microparticles" that comprise a nanoparticle and a resin coating on
the nanoparticle. Example dispersions of resin-coated nanoparticles
and methods for making them are identified in U.S. application Ser.
No. 10/876,031 filed Jun. 24, 2004, which is incorporated herein by
reference, and U.S. Provisional Application No. 60/482,167 filed
Jun. 24, 2003, which is also incorporated herein by reference.
[0047] Example special effect compositions that may be used in the
polyurea coating of the present invention include pigments and/or
compositions that produce one or more appearance effects such as
reflectance, pearlescence, metallic sheen, phosphorescence,
fluorescence, photochromism, photosensitivity, thermochromism,
goniochromism and/or color-change. Additional special effect
compositions can provide other perceptible properties, such as
reflectivity, opacity or texture. In a non-limiting embodiment,
special effect compositions can produce a color shift, such that
the color of the coating changes when the coating is viewed at
different angles. Example color effect compositions are identified
in U.S. Pat. No. 6,894,086, incorporated herein by reference.
Additional color effect compositions can include transparent coated
mica and/or synthetic mica, coated silica, coated alumina, a
transparent liquid crystal pigment, a liquid crystal coating,
and/or any composition wherein interference results from a
refractive index differential within the material and not because
of the refractive index differential between the surface of the
material and the air.
[0048] In certain non-limiting embodiments, a photosensitive
composition and/or photochromic composition, which reversibly
alters its color when exposed to one or more light sources, can be
used in the coating of the present invention. Photochromic and/or
photosensitive compositions can be activated by exposure to
radiation of a specified wavelength. When the composition becomes
excited, the molecular structure is changed and the altered
structure exhibits a new color that is different from the original
color of the composition. When the exposure to radiation is
removed, the photochromic and/or photosensitive composition can
return to a state of rest, in which the original color of the
composition returns. In one non-limiting embodiment, the
photochromic and/or photosensitive composition can be colorless in
a non-excited state and exhibit a color in an excited state. Full
color-change can appear within milliseconds to several minutes,
such as from 20 seconds to 60 seconds. Example photochromic and/or
photosensitive compositions include photochromic dyes.
[0049] In a non-limiting embodiment, the photosensitive composition
and/or photochromic composition can be associated with and/or at
least partially bound to, such as by covalent bonding, a polymer
and/or polymeric materials of a polymerizable component. In
contrast to some coatings in which the photosensitive composition
may migrate out of the coating and crystallize into the substrate,
the photosensitive composition and/or photochromic composition
associated with and/or at least partially bound to a polymer and/or
polymerizable component in accordance with a non-limiting
embodiment of the present invention, have minimal migration out of
the coating. Example photosensitive compositions and/or
photochromic compositions and methods for making them are
identified in U.S. application Ser. No. 10/892,919 filed Jul. 16,
2004 and incorporated herein by reference.
[0050] In general, the colorant can be present in the coating
composition in any amount sufficient to impart the desired
property, visual and/or color effect. The colorant may comprise
from 0.1 to 65 weight percent of the present compositions, such as
from 3 to 40 weight percent or 5 to 35 weight percent, with weight
percent based on the total weight of the compositions. In certain
embodiments, the weight percent of pigment may be 0.1 to 1.0 weight
percent.
[0051] In another embodiment, the polyurea coating compositions of
the present invention when applied to a substrate possesses color
that matches the color of an associated substrate. As used herein,
the term "matches" or like terms when referring to color matching
means that the color of the coating composition of the present
invention substantially corresponds to a desired color or the color
of an associated substrate. For instance, when the substrate for
the polyurea coating composition is a portion of a vehicle, such as
a truck bed, the color of the coating substantially matches that of
the associated vehicle body. This can be visually observed, or
confirmed using spectroscopy equipment.
[0052] The coatings of the present invention may be part of a
multi-layer coating composite comprising a substrate with various
coating layers such as a pretreatment layer, electrocoat, primer,
base coat and clear coat. At least one of the base coat and clear
coat may contain pigment and/or the clear coat may contain an
adhesion promoter and any of these coatings can be the coatings
described herein. It is believed that the addition of adhesion
promoter to the clear coat, or to its surface, may improve the
adhesion between the clear coat and the coating composition applied
thereover, although the inventors do not wish to be bound by any
mechanism. In this embodiment, the coating composition of the
present invention may be the reaction product of isocyanate and the
(meth)acrylated amine with a pigment additive. The coating
composition of the present invention containing pigment may be
applied to at least a portion of the article or structure. The
color of the coated article or structure may match the color of an
associated substrate. An "associated substrate" may refer to a
substrate that comprises the article or structure but is not coated
with the coating composition of the present invention; or a
substrate that is attached, connected or in close proximity to the
article or structure, but is not coated with the coating
composition of the present invention.
[0053] As used herein, unless otherwise expressly specified, all
numbers such as those expressing values, ranges, amounts or
percentages may be read as if prefaced by the word "about", even if
the term does not expressly appear. Any numerical range recited
herein is intended to include all sub-ranges subsumed therein.
Plural encompasses singular and vice versa. For example, while the
invention has been described herein including the claims in terms
of "a" polyurea, "an" isocyanate, "a" polyamine, "a"
mono(meth)acrylate, "an" (meth)acrylated amine reaction product and
the like, mixtures of such things can be used. Also, as used
herein, the term "polymer" is meant to refer to prepolymers,
oligomers and both homopolymers and copolymers; the prefix "poly"
refers to two or more.
EXAMPLES
[0054] The following examples are intended to illustrate the
invention, and should not be construed as limiting the invention in
any way. As will be appreciated by those skilled in the art MW
refers to average molecular weight, M.sub.w refers to weight
average molecular weight and M.sub.n refers to number average
molecular weight.
Example A
[0055] An amine/acrylate curative was prepared from the following
ingredients:
TABLE-US-00001 Ingredient Wt in g Charge 1 Isophorone diamine 937.2
2,6-di-t-butyl p-cresol 2.31 Charge 2 Butyl acrylate 1382.0 Charge
3 Isophorone diamine 18.0
[0056] Charge 1 was added to a suitable reactor equipped with an
overhead stirrer, thermocouple, condenser, and N.sub.2 inlet. The
charge was placed under an N.sub.2 blanket. Beginning at a
temperature of 21.degree. C., Charge 2 was added to the reactor
over a period of 4.5 hours. A mild exotherm was observed during the
addition. At the completion of the charge, the temperature of the
reaction mixture was 31.degree. C. The contents of the reactor were
heated to 70.degree. C. with an external heat source and held at
this temperature for 5.8 hours. Inspection of the infrared spectrum
of the reaction mixture indicated the presence of butyl acrylate
(peaks at 1621, 1635 cm.sup.-1). The temperature of the reaction
mixture was raised to 80.degree. C. and held at this temperature
for 14.7 hours. Inspection of the infrared spectrum at this time
indicated the presence of a small amount of butyl acrylate. Charge
3 was then added to the reaction mixture. The reaction mixture was
heated to 85.degree. C. and held for 6 hours. Inspection of the
infrared spectrum at this time indicated consumption of butyl
acrylate. The resulting material was found to have a measured
solids content of (110.degree. C., 1 hr) of 96.3 percent, a
viscosity of A+ on the Gardner-Holt scale, a total amine content of
4.797 meq/g, a residual primary amine content of 0.042 meq/g, a
secondary amine content of 4.643 meq/g, a tertiary amine content of
0.112 meq/g, and a M.sub.w of 359 and a M.sub.n of 314 as
determined by gel permeation chromatography vs. a polystyrene
standard.
Example B
[0057] An amine/acrylate curative was prepared from the following
ingredients:
TABLE-US-00002 Ingredient Wt in g Charge 1
3,3'-dimethyl-4,4'-diaminodicyclohexylmethane 417.2 4-methoxyphenol
0.4 Charge 2 methyl acrylate 289.0 Charge 3 Methanol 42.6
[0058] Charge 1 was added to a suitable reactor equipped with an
overhead stirrer, thermocouple, condenser, and air inlet. The
charge was placed under a light air blanket. Beginning at a
temperature of 22.degree. C., Charge 2 was added to the reactor
over a period of 10 minutes. At the completion of the charge, the
temperature of the reaction mixture was 20.degree. C. Charge 3 was
then added to the reaction mixture over 5 minutes. A mild exotherm
was observed; at the completion of this charge, the temperature of
the reaction mixture was 31.degree. C. The contents of the reactor
were heated to 75.degree. C. with an external heat source and held
at this temperature for 11.9 hours. Inspection of the infrared
spectrum at this time indicated consumption of methyl acrylate
(disappearance of peaks at 1621, 1635 cm.sup.-1). The reactor was
equipped for simple vacuum distillation. Volatiles were removed
from the system over a period of 1.4 hours at a temperature range
of 75 to 85.degree. C. The resulting material was found to have a
measured solids content (110.degree. C., 1 hr) of 99.5 percent, a
viscosity of K on the Gardner-Holt scale, a density of 8.51 lb/gal,
a total amine content of 5.089 meq/g, a residual primary amine
content of 0.603 meq/g, a secondary amine content of 3.995 meq/g, a
tertiary amine content of 0.491 meq/g, a residual methanol content
of <0.01 percent by gas chromatography, and a M.sub.w of 335 and
a M.sub.n of 348 as determined by gel permeation chromatography vs.
a polystyrene standard.
Example C
[0059] An amine/methacrylate/acrylate curative was prepared from
the following ingredients:
TABLE-US-00003 Ingredient Wt in g Charge 1 Isophorone diamine 170.4
Methyl methacrylate 160.0 2,6-di-tert-butyl p-cresol 2.2 Dibutyltin
dilaurate 1.7 Charge 2 Butyl acrylate 43.5 Charge 3 4-methoxyphenol
0.7
[0060] Charge 1 was added to a suitable reactor equipped with an
overhead stirrer, thermocouple, condenser, and sparge tube. The
charge was placed under a light air sparge of approximately 0.5
SCFH. The reaction mixture was heated to a temperature of
80.degree. C. and held at this temperature for approximately 35.3
hours. The progress of the reaction was followed by measuring
solids (110.degree. C., 1 hour). The reaction mixture was held to a
measured solids of 85.0 percent. The temperature was reduced to
52.degree. C. Charge 2 was added to the reactor over 1 minute; the
temperature at the end of this addition was 49.degree. C. The
temperature was increased to 60.degree. C. and the reaction mixture
held at this temperature for approximately 9 hours. Inspection of
the infrared spectrum of the reaction mixture at this time
indicated consumption of butyl acrylate (absence of peaks at 1621,
1635 cm.sup.-1). Charge 3 was added to the reaction mixture and the
reactor configured for simple vacuum distillation. Vacuum was
applied to the reaction mixture for 1 hour to remove volatiles; the
temperature range was 51-60.degree. C. and the maximum vacuum
obtained was 180 mm Hg. The resulting material was found to have a
measured solids content of (110.degree. C., 1 hr) of 96.2 percent,
a density of 8.33 lb/gal, a viscosity of Z3 on the Gardner-Holt
scale, a total amine content of 4.892 meq/g, a residual primary
amine content of 0.055 meq/g, a secondary amine content of 4.766
meq/g, a tertiary amine content of 0.071 meq/g, a residual methyl
methacrylate and butyl acrylate content of 0.94 and 0.51 percent
respectively by gas chromatography, and a M.sub.w of 399 and a
M.sub.n of 335 as determined by gel permeation chromatography vs. a
polystyrene standard.
Example D
[0061] An acrylate/aspartate amine curative was prepared from the
following ingredients:
TABLE-US-00004 Ingredient Wt in g Charge 1 Isophorone diamine
2982.0 2,6-di-tert-butyl p-cresol 3.5 Charge 2 Dibutyl maleate
1995.0 Charge 3 2,6-di-tert-butyl p-cresol 3.5 Charge 4 Butyl
acrylate 3270.4
[0062] Charge 1 was added to a suitable flask equipped with an
overhead stirrer, thermocouple, condenser, and N.sub.2 inlet. The
charge was placed under an N.sub.2 blanket. Beginning at a
temperature of 21.degree. C., Charge 2 was added to the flask over
a period of 5.75 hours. A mild exotherm was observed during the
addition. A maximum temperature of 35.degree. C. was observed
during the addition of this charge. At the completion of the
charge, the temperature of the reaction mixture was 33.degree. C.
The reaction mixture was heated to a temperature of 35-37.degree.
C. with an external heat source and held at this temperature for 3
hours. Inspection of the infrared spectrum of the reaction mixture
indicated consumption of dibutyl maleate (disappearance of peak at
1646 cm.sup.-1). Charge 3 was added to the reactor, and the
reaction mixture heated to 43.degree. C. Charge 4 was added to the
reaction mixture for 3.6 hours; a mild exotherm was observed. The
temperature range of the reaction mixture over the course of Charge
4 was between 43 and 50.degree. C.; at the completion of Charge 4
the temperature was 45.degree. C. The temperature of the reaction
mixture was then raised to 50.degree. C. and held for 3 hours.
Inspection of the infrared spectrum of the reaction mixture
indicated the presence of unreacted acrylate (peaks at 1621, 1635
cm.sup.-1). The temperature of the reaction mixture was raised to
70.degree. C. and held for 10.9 hours. Inspection of the infrared
spectrum of the reaction mixture indicated that the presence the
aforementioned peaks attributed to the acrylate could not be
distinguished from baseline noise; at this point the reaction was
judged to be complete. The resulting material was found to have
measured solids content (110.degree. C., 1 hr) of 98.9 percent, a
viscosity of D on the Gardner-Holt scale, a density of 8.17 lb/gal,
a total amine content of 4.21 meq/g, a residual primary amine
content of 0.230 meq/g, a secondary amine content of 3.985 meq/g, a
tertiary amine content of 0.000 meq/g, and a M.sub.w of 450 and a
M.sub.n of 406 as determined by gel permeation chromatography vs. a
polystyrene standard.
Example E
[0063] An acrylate modified amine curative was prepared from the
following ingredients:
TABLE-US-00005 Ingredient Wt in g Charge 1 JEFFAMINE D2000.sup.1
3490.5 2,6-di-tert-butyl p-cresol 7.77 Dibutyltin dilaurate 19.4
Charge 2 Butyl acrylate 437.9 .sup.1Polyoxyalkylenediamine of
approximately 2000 MW, available from Huntsman Corporation.
[0064] Charge 1 was added to a suitable flask equipped with an
overhead stirrer, thermocouple, condenser, and air inlet. The
charge was placed under an air blanket. Beginning at a temperature
of 22.degree. C., Charge 2 was added to the over 18 minutes. No
exotherm was observed. The reaction temperature was increased to
70.degree. C. and held for 2.9 hours. Inspection of the infrared
spectrum of the reaction mixture indicated the presence of
unreacted acrylate (peaks at 1621, 1635 cm.sup.-1). The temperature
of the reaction mixture was raised to 90.degree. C. and held for
8.8 hours. At this point, the infrared spectrum of the mixture
indicated that the acrylate had been consumed. The resulting
material was found to have measured solids content (110.degree. C.,
1 hr) of 95.4 percent, a viscosity of G- on the Gardner-Holt scale,
a total amine content of 0.884 meq/g, a primary amine content of
0.155 meq/g, a secondary amine content of 0.702 meq/g, a tertiary
amine content of 0.022 meq/g, a M.sub.W of 2180, a M.sub.n of 769,
and M.sub.w of 2993 as determined by gel permeation chromatography
vs. a polystyrene standard.
Example F
[0065] An amine/epoxy adduct was prepared from the following
ingredients:
TABLE-US-00006 Ingredient Wt in g Charge 1 Isophorone diamine
2044.8 Charge 2 CARDURA E10 P.sup.2 6000.0 .sup.2Glycidyl ether of
neodecanoic acid, available from Hexion Specialty Chemicals,
Inc.
[0066] Charge 1 was added to a suitable reactor equipped with an
overhead stirrer, thermocouple, condenser, and N.sub.2 inlet. The
charge was placed under an N.sub.2 blanket and heat applied to the
reactor. Beginning at a temperature of 62.degree. C., Charge 2 was
added to the reactor over a period of 6.9 hours over a temperature
range of 62 to 92.degree. C. During the feed, the heating mantle
was raised or lowered and cooling (water bath or air flow) applied
to the reactor as required to control the reaction temperature. At
the completion of the addition, the temperature of the reaction
mixture was 77.degree. C. The reaction mixture was held at
80.degree. C. for 8.6 hours, then at 85.degree. C. for 1.6 hours.
At this time the epoxy equivalent weight was found to be 55556, and
the reaction was judged to be complete. The resulting material was
found to have a measured solids content of (110.degree. C., 1 hr)
of 98.7 percent, a viscosity of Z10 on the Gardner-Holt scale, a
total amine content of 2.969 meq/g, a residual primary amine
content of 0.170 meq/g, a secondary amine content of 2.504 meq/g, a
tertiary amine content of 0.295 meq/g, a hydroxyl value of 160.1,
and a M.sub.w of 657 and a M.sub.n of 562 as determined by gel
permeation chromatography vs. a polystyrene standard.
Example 1
[0067] An isocyanate functional "A" side formula was prepared from
the following ingredients:
TABLE-US-00007 Ingredients % by wt TERATHANE 650.sup.3 21.0
1,2-butanediol 1.2 Neopenyl glycol 1.2 Isophorone diisocyanate 27.1
DESMODUR N3400.sup.4 49.4 .sup.3Polytetramethylene ether glycol,
available from Invista. .sup.4Aliphatic polyisocyanate resin based
on hexamethylene diisocyanate, available from Bayer
Corporation.
[0068] TERATHANE 650, neopenyl glycol, 1,2-butanediol, and a
catalytic amount of dibutyltin dilaurate (0.013% by wt of the three
glycols) were charged to a suitable reactor under nitrogen.
Isophorone diisocyanate was added to the reactor over 105 minutes
at a temperature range of 36-37.degree. C. Over a period of 50
minutes the temperature of the mixture was increased to 52.degree.
C. Over a period of 60 minutes the temperature increased to a
maximum of 125.degree. C. After another 60 minutes the resulting
prepolymer equivalent weight was found to be within specification.
The resulting prepolymer was cooled to 71.degree. C. and poured
into 87.9% of the DESMODUR N3400 and stirred for 30 minutes. The
remaining DESMODUR N3400 was added to adjust to a final isocyanate
equivalent weight of 264.9.
Examples 2-4
[0069] Pigment grinds were prepared according to the formulas in
Table 1:
TABLE-US-00008 TABLE 1 Ingredient Example 2 Example 3 Example 4
MMA/BA JEFFAMINE T3000.sup.5 359.3 158.4 JEFFAMINE 275.3
D2000/butyl acrylate adduct of Example E Acrylate/aspartate 359.3
366.3 250.1 amine curative of Example D Amine/epoxy adduct of 179.6
Example F JEFFLINK 754.sup.6 191.4 CLEARLINK 1000.sup.7 146.5
TINUVIN 292.sup.8 18.0 11.8 7.9 VULCAN XC72.sup.9 21.6 14.2 9.5
BENTONE 34.sup.10 62.3 41.0 27.5 .sup.5Polyoxyalkylenetriamine of
approximately 3000 MW, available from Huntsman Corporation.
.sup.6Aliphatic secondary amine, available from Huntsman
Corporation. .sup.7Aliphatic secondary amine, available from Dorf
Ketal Chemicals, LLC. .sup.8Hindered amine light stabilizer,
available from Ciba Speciality Chemicals Corporation. .sup.9Carbon
black pigment, available from Cabot Corporation. .sup.10Organoclay
rheology additive, available from Elementis Specialities, Inc.
[0070] In each example, the ingredients were combined and charged
to a Model M250 bead mill (Eiger Machinery, Inc.) with 188 mL
Zirconox 1.0 mm beads (Jyoti Ceramic Industries Pvt. Ltd.) and
ground at a mill speed of 3500 rpm. The grinds were judged to be
complete when the particle size was found to be 7.5 Hegman upon
drawdown on a fineness of grind gauge.
Examples 5-7
[0071] The following "B" side formulations were produced as shown
in Table 2:
TABLE-US-00009 Ingredient Example 5 Example 6 Example 7 Pigment
grind of Example 2 155.9 Pigment grind of Example 3 152.3 Pigment
grind of Example 4 151.5 JEFFAMINE T3000 8.68 8.8 JEFFLINK 754 0.1
CLEARLINK 1000 18.2 Amine/acrylate curative of 56.0 Example A
Amine/acrylate curative of 40.0 Example B Amine/acrylate curative
of 20.0 Example C Acrylate/aspartate amine 19.6 curative of Example
D Jeffamine D2000/butyl acrylate 6.1 adduct of Example E
Amine/epoxy adduct of 37.74 Example F Dibutyltin dilaurate 2.10 1.5
1.5
[0072] The B side formulations of Table 2 above and the A side
formulation of Example 1 were charged to separate canisters and
heated to 140.degree. F. (Examples 8 to 11) and 160.degree. F.
(Examples 12 and 13) in an oven for 4-6 hrs prior to spraying.
Polyurea coating compositions were produced by mixing a 1:1 volume
ratio of the A-side components to each the B-side components in a
static mix tube applicator device available from Cammda
Corporation. In Examples 8 to 11, the coating compositions were
applied to cold rolled steel panels coated with an
electrodeposition primer and an epoxy acid clearcoat (APR 26241
available from ACT Laboratories, Inc.) In Examples 12 and 13, the
coatings were applied to steel panels coated with DuPont GEN V
clearcoat. Tack times for the coatings were determined by
periodically touching the panel with a gloved hand as previously
described and were judged to be tack free when the glove no longer
stuck to the coatings.
[0073] Hardness values were determined by charging the A and B side
components into a double-barreled syringe equipped with a static
mix tube and a "Pneumatic applicator" (PC Cox Limited) and
injecting the components at a 1:1 ratio using a into a mold to form
a round "puck" of approximately 6 cm in diameter and 0.2 cm in
thickness. The hardness of the polyurea coating puck at ambient
temperature was measured on the Shore D scale with a Model 212
Pencil Style Digital Durometer (Pacific Transducer Corp.) 1 day
after application. The pucks were then placed in a 140.degree. F.
"hot room" for 1 day and the Shore D hardness of the coating
measured with the puck in the hot room to prevent cooling. The
pucks were removed from the hot room to ambient temperature and the
hardness measured again at ambient temperature after 1 day.)
[0074] The ratio of equivalents of isocyanate to amine was
calculated as being approximately 1.10 for the polyurea formulation
comprising the B side component of Example 5, 1.09 for the polyurea
formulation comprising the B side component of Example 6, 1. and
1.104 for the polyurea formulation comprising the B side component
of Example 7.
[0075] Table 3 shows results of characterization of the resulting
coatings:
TABLE-US-00010 TABLE 3 Example 5 Example 6 Example 7 Tack free time
(sec) 31 33 13 Hardness (Shore D) 62 68 69 measured after cure
Hardness (Shore D) after 3 40 32 33 days at 140.degree. F. Hardness
(Shore D) after 66 70 71 recovery
* * * * *